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The fourth edition of SEG’s best-seller by Robert E. Sheriff is a valuable, comprehensive reference for every geophysicist, geologist, explorationist, engineer, energy adviser, economist, and student involved in the field. Published in print and CD-ROM in 2002 and online for the first time in 2005, this reference contains hundreds of terms added since publication of the third edition in 1991, reflecting rapid evolution of the science. Most new terms are in the areas of engineering and production problems, 3D (including multicomponent) acquisition and processing, visualization, S- and converted waves, interpretation, anisotropy, AVO, geostatistics, geohazards, neural networks, tomography, downhole measurements, horizontal drilling, and deepwater work. Definitions of hundreds of other terms have been updated. The dictionary includes a guide to pronunciation and reference figures and tables.

All visitors to the Encyclopedic Dictionary site have access to the list of terms, the search engine, the introductory texts, the appendices, and the references. Access to definitions and associated figures is limited to subscribers.